Im looking for a 12 V wire that is only hot when the ignition is on. I need to run it back to my amp. It seems that all the wires behind the radio are hot all the time.

Thanks,
Matt

 

How about a model year, trim level, and cab type to go with that question ?

Either that, or complete your profile.

Depending on the MY truck, the accessory delay runs the radio, but this would show hot until you open the door, or until the time runs out on the Accy Delay relay coil trigger. At the very least there needs to be a hot in run / accy position on the radio, else it would be able to stay on at any time.

 

Only one I know of is the blue and yellow wire running up the passenger a-pillar and through the headliner to the rearview.

 

do you plan on powering your amp with a dinky little wire that you splice off of something else in the truck?
if this is to power your amp then the proper and really the only way is to go directly to the battery.

edit: youll probably have better luck in the amplifier section.

 

ok im sorry i should have been more specific. I have an 05 screw cab.

I have the power wire ran from my battery to the amp, but i have a stock head unit so i am using a high low converter to control my amp from the stock HU. I just need a 12 v switch wire to tell my amp to turn on and off with the ignition. This wire is not actually powering my amp.

 

then what SSCULLY suggested is perfect for you. the radio stays on with the accessory delay. and with the radio powered your amp is turned on so you can here the music til the delay times out or the door is opened.

 

ok thanks, do you know the color of the wire i should be looking for?

 

In my 04 heritage I ran that wire into the fuse box to some fuse (I forgot which one) and it has been working fine for over a year.

 

it will be red. and it will probably be the biggest gauge wire in the harness.

 

The accsy delay wire to the back of the radio is the light green w/ yellow stripe wire. This is the circuit from F22.

Obviously do not try to use this to power the amp, this would be either for a + trigger to the amp, or used with to power the coil on a relay to the AMP.

Got me who your amp works, no info posted on that in this thread.